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Figure 6. Mounting the cooling system bottle
3.3. Control system of the electromagnetic base holding force
The MINIBEAST AUTO drilling machine incorporates a holding force control system to
monitor the adhesion force of the electromagnetic base to the surface. The force value
depends on several factors, such as type, thickness, flatness, and roughness of the surface,
presence of paint, rust or other contaminants, supply voltage fluctuations, and the wear of
the electromagnetic base bottom. With the motor off, the base provides a fraction of the
maximum holding force. Once the motor is started, the holding force rises to the maximum.
If the holding force falls below a safe operating value, the control system will not allow the
machine to operate. Additionally, the system will prevent the startup of the motor if the
machine is placed on a surface thinner than 5 mm (0.2'') as such thickness does not provide
sufficient holding force. In such case, the adhesion force will be only about 25% of the force
attained on a standard 22 mm (0.87'') flat plate.
If the motor does not continue operation after the green MOTOR button is pushed and
released, it means that the control circuit is operating properly and preventing further
drilling because of too low adhesion force.
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